What command would you use to enable multiple spanning tree?

Enter the show spanning-tree mst command to display the information about the IST master, path cost, and remaining hops for the bridge. A port that is connected to a nonbridging device (for example, a host or a switch) is an edge port.

Which command will allow multiples instances of STP on a switch?

We can use the show spanning-tree mst configuration command to verify our configuration. You can see that we now have two instances.

How multiple spanning trees work?

Multiple Spanning Tree Instances (MSTI) As MSTP enables grouping and mapping VLANs into different spanning tree instances, there’s an urge of determining a group or set of VLANs, which are all using the same spanning tree, this is what we come to know as a MSTI.

Which STP version is used for handling multiple instances of STP?

Multiple Spanning Tree (MST) is an IEEE standard inspired from the Cisco proprietary Multiple Instances Spanning Tree Protocol (MISTP) implementation. This document assumes that the reader is familiar with Rapid STP (RSTP) (802.1w), as MST heavily relies on this other IEEE standard.

How do I configure Rapid STP?

To configure Rapid Spanning Tree Protocol (RTSP): Choose Networking > LAN > RSTP. Choose the system priority from the drop-down menu. You can choose from a system priority from 0 to 61440 in increments of 4096.

What are spanning tree modes?

The Spanning Tree Protocol (STP) is defined by IEEE standard 802.1D-1988. The STP generates a single spanning tree inside a network. Such mode proved to be useful for supporting applications and protocols in which frames are delivered out of sequence or as duplicates.

What is Multiple Spanning Tree Protocol (MST)?

Multiple Spanning Tree Protocol gives you the ability to configure a hierarchical spanning tree topology where you have a common spanning tree instance known as the (CIST), technically instance 0 in MST Configuration mode. MST is designed in a way that you’ll have regional STP instances.

How many instances of spanning tree are in a catalyst switch?

Multiple Spanning Tree (MST) By default Cisco Catalyst Switches run PVST+ or Rapid PVST+ (Per VLAN Spanning Tree). This means that each VLAN is mapped to a single spanning tree instance. When you have 20 VLANs, it means there are 20 instances of spanning tree.

Why do we have multiple spanning-tree modes?

Our multiple spanning-tree modes, IEEE 802.1s MSTP, PVST+, and RPVST+, allow us to have various spanning-tree instances. These instances can take different paths through the network by having different root bridges, enabling load balancing to be possible.

How many spanning tree calculations (instances) are required for each VLAN?

Only two spanning tree calculations (instances) are required for all these VLANs. MST works with the concept of regions. Switches that are configured to use MST need to find out if their neighbors are running MST. When switches have the same attributes they will be in the same region.